Storing functions in separate file

[SCass2010]

Hi everyone,

I'm currently trying to do a bit of java programming after not looking near it for almost a year. Most of what I've been doing has been C/C++, and I was just wondering -

in C++ you could have a header file with functions only in it, say "MyFunctions.h"

int functionA ()
{
    return 10;
}

string functionB ()
{
    return "hello";
}

double functionC ()
{
    return 5.5;
}

And include this file in another - so you could just call "double d = functionC ();", so i was wondering is there a way to do this in Java, or would I have to put all the functions within a class, create an instance of the class and call them that way? A bit of a stupid question I know but any help would be much appreciated :)

[wen_cai]

From the code above, do you mean a constant? You can create a static class where you can just call MyClass.functionc(). You do not need to create a new instance of the class. If that is what you are looking for.

[JamesCherrill]

In Java you do this by creating a utility class with all those functions defined as static (so they don't need an instance to be created). A good example is the Math class in the standard Java API
http://docs.oracle.com/javase/6/docs/api/java/lang/Math.html
you can simply import this class at the start of your program, then call the methods like Math.cos(x) or whatever.

[JamesCherrill]

ps
If you import static the class then you can use its static methods without prefixing the class name
ie

import static java.lang.Math.*;
...
x = cos(y);  // static method cos is resolved via the import static for Math

[SCass2010]

Ah right, forgot about static methods in java... it really has been a while :) thanks again!!!!